After the series of events he had gone through, John understood that any hesitation in facing a Sacred Relic like the Mystery Eye Gemstone could lead to failure.
So, having decided to take direct action to gain control of the Mystery Eye Gemstone, John was prepared to exert his full power.
He threw the Book of the Astral Realm from his pocket.
The moment it was drawn from John's pocket, it sealed all the surrounding Mystery forces.
Although the sealing power of the Book of the Astral Realm wasn't directly targeting the Mystery Eye Gemstone, the powerful residual sealing force temporarily sealed the curses emanating from the gemstone.
With the assistance of the Book of the Astral Realm's astral powers, John no longer needed to focus all his energy on countering the curses from the Mystery Eye Gemstone.
